In case you use a contact form on Opencart, to avoid sending spam, for security reasons it is good to activate outgoing mail authentication (SMTP authentication). You can do this by following the steps below:
1. Log in to the Administrator environment of Opencart for your site by entering, for example, the following address: www.yoursite.gr/admin
2. Select System and Settings and finally the blue pencil icon at the far right of the main window.
3. Go to the Mail tab and make the following settings:
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